A while ago, I thought: mainnet = secure, L2 = cheap but "wild," so I would avoid L2 if I could. Now I understand it a bit differently: the mainnet is like a high-speed rail station, expensive but regulated; L2 is more like the subway, comfortable for daily interactions, and for final settlement or large transactions, you can go back to the mainnet. The compromise is to put "frequent small operations" on L2 and keep "key assets/long-term positions" on the mainnet.

Recently, I see everyone watching large on-chain transfers and the movements of hot and cold wallets on exchanges as smart money, and I also get curious and take a look... But honestly, these signals are more emotional amplifiers and have little to do with how much gas you save. My small habit is: keep some gas ready for a few commonly used L2s (enough for a few weeks). When I really need to cross-chain or bring assets back to the mainnet, I choose a non-peak window and avoid fighting the rush hour. Anyway, only when the experience is good will I truly start using the protocols.